<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'index.jsp' starting page</title>
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->
	<style type="text/css">
	#time{
		width:300px;
		height:200px;
		border:1px solid #000;
		margin: 0px auto;
	}
	
	</style>
	<script type="text/javascript">
	var xhr;
	function getTime() {
		//1.创建ajax核心对象
		xhr = new XMLHttpRequest();
		//2.与服务器建立连接
		//xhr.open("GET", "time?num="+Math.random(), true);
		xhr.open("GET", "time?date="+new Date(), true);
		//3.发送请求
		xhr.send(null);
		//4.处理响应
		xhr.onreadystatechange=mycallback;
	}
	//处理响应的函数
	function mycallback(){
		//alert("回调函数："+xhr.readyState );
		if( xhr.readyState==4 && xhr.status == 200 ){
			document.getElementById("time").innerHTML+=xhr.responseText+"<br/>";
			
		}
		
	}
	
	
	
	</script>
	
  </head>
  
  <body>
    <div id="time">
    
    </div>
    <input type="button" value="查询时间" onclick="getTime()"> 
    
  </body>
</html>
